True False Science Class 10 Chapter 9: Heredity and Evolution

Read the following statements and write your answer as true of false.:

Question.1.
Reduction in weight of the organism due to starvation is genetically controlled.

False

Question.2.
New species may be formed if DNA undergoes significant changes germ cells or chromosome number changes in the gametes.

Question.3.
Variation is minimum in asexual reproduction.

Question.4.
Tendril of a pea plant and phylloclade of Opuntia are homologous.

Question.5.
The artificial classification of organisms is based on homology.

Question.6.
A trait in an organism is influenced by both maternal and paternal DNA.

Question.7.
The similarities in homologous organs are because of convergent evolution.

Question.8.
A factor which shows its effect in the hybrid is called recessive.

False

Question.9.
Dromaesaurs were the first to fly.

False

Question.10.
Attached ear lobe is recessive trait.

Question.11.
Charles Darwin discovered the law of independent assortment.

False

Question.12.
Selection of variants by environmental factors forms the basis of evolutionary process.

Question.13.
The more characteristics two species will have in common, the more closely they are related.

Question.14.
Traits which are not inherited over generations do not cause evolution.

Question.15.
Both the parents contribute DNA equally to the offspring.

Question.16.
Sex of the child is determined by the type of ovum provided by the mother.

False

Question.17.
A recessive trait can also be common as blood group O.

Question.18.
There was plenty of oxygen present in atmosphere of primitive earth.

False

Question.19.
Variations arising during the process of reproduction cannot be inherited.

False

Question.20.
Sex is determined by different factors in various species.

Question.21.
At present time evolution is not possible.

False

Question.22.
Mouth parts of insects show divergent evolution.

Question.23.
Life can originate on earth from pre-existing life only.

Question.24.
The atmosphere of the primitive earth was reducing.

Question.25.
Changes in the non-reproductive tissues caused by environmental factors are inheritable.

False

Question.26.
Evolution cannot be said to ‘progress’ from ‘lower’ forms to ‘higher’ forms.

Question.27.
Exchange of genetic material takes place in asexual reproduction.

False

Question.28.
A cross between a true tall and pure dwarf pea plant resulted in production of all tall plants because tallness is the dominant trait.

Question.29.
For every molecule of fat there is a gene.

False

Question.30.
Reduction in weight of an organism due to nutrition is genetically controlled.

False

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